6985921 has 4 divisors (see below), whose sum is σ = 7017472. Its totient is φ = 6954372.

The previous prime is 6985907. The next prime is 6985931. The reversal of 6985921 is 1295896.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6985921 - 2⁹ = 6985409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6985931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15441 + ... + 15886.

It is an arithmetic number, because the mean of its divisors is an integer number (1754368).

Almost surely, 2^6985921 is an apocalyptic number.

It is an amenable number.

6985921 is a deficient number, since it is larger than the sum of its proper divisors (31551).

6985921 is a wasteful number, since it uses less digits than its factorization.

6985921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31550.

The product of its digits is 38880, while the sum is 40.

The square root of 6985921 is about 2643.0892909624. The cubic root of 6985921 is about 191.1647838277.

The spelling of 6985921 in words is "six million, nine hundred eighty-five thousand, nine hundred twenty-one".